US4614696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative electrode plate for alkaline storage cells of sealed type
Assignee: Sanyo Electric Co Ltd
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Filing: 1984-12-12
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Granted: 1986-09-30
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Expires: 2004-12-12
Abstract
Abstract The present invention provides a negative electrode plate for alkaline storage cells of the sealed type which comprises an active material layer formed on each of opposite surfaces of an electrically conductive carrier sheet from a paste composed chiefly of a cadmium oxide powder, and an electrically conductive layer comprising a carbon powder and formed over the surface of the active material layer, which gives e.g., greatly improved ability to absorb oxygen gas.
Inventors
- 👤 Tukasa Ito
- 👤 Noriyuki Miyazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/04; H01M4/0438; H01M4/044; H01M4/0445; H01M10/00; H01M10/34; H01M4/24; H01M4/246; H01M4/62; H01M4/621; H01M4/624; H01M4/64; H01M4/66; H01M4/665; H01M4/667; H01M4/70; H01M4/72; H01M4/74; H01M4/742; H01M10/42; H01M10/52; H01M10/526; H01M4/625; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A negative electrode plate for alkaline storage cells of the sealed type comprising an active material layer formed on each of opposite surfaces of an electrically conductive carrier sheet from a paste comprising cadmium oxide powder, and an electrically conductive layer comprising carbon powder and a water-soluble binder formed on a surface of the active material layer.
Claim 2
Dependent Claim
57 words
A negative electrode plate for alkaline storage cells of the sealed type comprising an active material layer formed on each of opposite surfaces of an electrically conductive carrier sheet from a paste comprising cadmium oxide powder, and an electrically conductive layer comprising carbon powder and a water-soluble binder formed on a surface of the active material layer.
Claim 3
Dependent Claim
20 words
The negative electrode plate as defined in claim 1 wherein the conductive layer is 2 to 20 microns in thickness.
Claim 4
Dependent Claim
31 words
The negative electrode plate as defined in claim 1 wherein the water-soluble binder is formed with a binder material selected from the group consisting of polyvinyl alcohol, carboxymethylcellulose, methylcellulose and hydroxypropylcellulose.
Claim 5
Dependent Claim
15 words
The negative electrode plate as defined in claim 3 wherein the binder is polyvinyl alcohol.
Claim 6
Dependent Claim
29 words
The negative electrode plate as defined in claim 1 wherein said conductive layer is formed by transferring an aqueous slurry of the carbon powder via use of transfer rollers.
Claim 7
Dependent Claim
28 words
The negative electrode plate as defined in claim 1 wherein the active material layer contains short graphite fibers as the carbon fibers to form an electrically conductive matrix.
Claim 8
Dependent Claim
33 words
The negative electrode plate as defined in claim 1 wherein said negative electrode plate is charged to not more than 60% of its electrical capacity before or after the conductive layer is formed.
Claim 9
Dependent Claim
62 words
A negative electrode plate for alkaline storage cells of the sealed type comprising an active material layer formed on each of opposite surfaces of an electrically conductive carrier sheet and from a paste comprising cadmium oxide powder and carbon fibers, and an electrically conductive layer comprising carbon powder and a water soluble binder formed on a surface of the active material layer.
Claim 10
Dependent Claim
62 words
A negative electrode plate for alkaline storage cells of the sealed type comprising an active material layer formed on each of opposite surfaces of an electrically conductive carrier sheet and from a paste comprising cadmium oxide powder and carbon fibers, and an electrically conductive layer comprising carbon powder and a water soluble binder formed on a surface of the active material layer.
Claim 11
Dependent Claim
20 words
The negative electrode plate as defined in claim 8 wherein the conductive layer is 2 to 20 microns in thickness.
Claim 12
Dependent Claim
32 words
The negative electrode plate as defined in claim 8, wherein said water soluble binder is formed with a binder material selected from the group consisting of polyvinyl alcohol, carboxymethylcellulose, methycellulose and hydroxypropylcellulose.
Claim 13
Dependent Claim
15 words
The negative electrode plate as defined in claim 10 wherein said binder is polyvinyl alcohol.
Claim 14
Dependent Claim
27 words
The negative electrode plate as defined in claim 8 wherein the conductive layer is formed by transferring an aqueous slurry of said carbon powder with transfer rollers.
Claim 15
Dependent Claim
31 words
The negative electrode plate as defined in claim 8 wherein said active material forming the active material layer comprises said cadmium oxide powder and a small amount of metallic cadmium powder.
Claim 16
Dependent Claim
34 words
The negative electrode plate as defined in claim 8 wherein the active material layer contains 0.5 to 5 parts by weight of short graphite fibers per 100 parts by weight of the active material.
Claim 17
Dependent Claim
31 words
The negative electrode plate as defined in claim 1 wherein the active material forming the active material layer comprises the cadmium oxide powder and a small amount of metallic cadmium powder.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |